From: Ari Brown <ari@...>
Date: 2007-09-14T20:25:07+09:00
Subject: Failed Metaprogramming PLUS Stack Level Too Deep

Hey all

I'm trying to dynamically define a method which will do the following.

Example:
   def INPUT(&b)
     @chain = "INPUT"
     @file << "    # BEGIN rules for chain _INPUT_\n"
     instance_eval(&b)
     @file << "    # END rules for chain _INPUT_\n"
     @chain = nil
   end

So my plan is that I call
	chain "TEST_CHAIN"
and it will create a dynamic method as such.

However, due to my failure at life, liberty, and metaprogramming, I  
have to run through two commands in order to do this:

   def chain(name)
     Firewall.real_chain(name)
     $stderr.puts "Generating chain #{name} in table #{@table}" if  
@debug
     @file << "iptables -t #{@table} -N #{name}      # Adding chain # 
{name}\n"
   end

   def Firewall.real_chain(*names)
     names.each do |name|
       module_eval <<-"end_eval"

       def #{name} &b
         @chain = #{name}
         @file << "    # BEGIN rules for chain _#{name.upcase}_\n"
         instance_eval(&b)
         @file << "    # END rules for chain _#{name.upcase}_\n"
         @chain = nil
       end

       end_eval
     end

If I have module_eval in chain(), then I get an undefined method  
error. But here.... With this setup, I get a stack level too deep by  
calling:

TEST_CHAIN do
	puts 5
end

Or with any other block, for that matter.


Bwah? My brain hurts!
-------------------------------------------------------|
~ Ari
crap my sig won't fit